EP2217962A1 - Curved disc for modifying a power of an optical component - Google Patents

Curved disc for modifying a power of an optical component

Info

Publication number
EP2217962A1
EP2217962A1 EP08865631A EP08865631A EP2217962A1 EP 2217962 A1 EP2217962 A1 EP 2217962A1 EP 08865631 A EP08865631 A EP 08865631A EP 08865631 A EP08865631 A EP 08865631A EP 2217962 A1 EP2217962 A1 EP 2217962A1
Authority
EP
European Patent Office
Prior art keywords
pellet
circle
height
jumps
fresnel zones
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP08865631A
Other languages
German (de)
French (fr)
Other versions
EP2217962B1 (en
Inventor
Bruno Fermigier
Matthieu Koscher
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
EssilorLuxottica SA
Original Assignee
Essilor International Compagnie Generale dOptique SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Essilor International Compagnie Generale dOptique SA filed Critical Essilor International Compagnie Generale dOptique SA
Publication of EP2217962A1 publication Critical patent/EP2217962A1/en
Application granted granted Critical
Publication of EP2217962B1 publication Critical patent/EP2217962B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02C—SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES
    • G02C7/00—Optical parts
    • G02C7/02—Lenses; Lens systems ; Methods of designing lenses
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B3/00—Simple or compound lenses
    • G02B3/02—Simple or compound lenses with non-spherical faces
    • G02B3/08—Simple or compound lenses with non-spherical faces with discontinuous faces, e.g. Fresnel lens
    • G—PHYSICS
    • G02—OPTICS
    • G02C—SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES
    • G02C7/00—Optical parts
    • G02C7/02—Lenses; Lens systems ; Methods of designing lenses
    • G02C7/08—Auxiliary lenses; Arrangements for varying focal length
    • G02C7/086—Auxiliary lenses located directly on a main spectacle lens or in the immediate vicinity of main spectacles
    • G—PHYSICS
    • G02—OPTICS
    • G02C—SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES
    • G02C2202/00—Generic optical aspects applicable to one or more of the subgroups of G02C7/00
    • G02C2202/20—Diffractive and Fresnel lenses or lens portions

Definitions

  • the present invention relates to a curved patch for attachment to a concave face of an optical component for modifying an optical power thereof. It also relates to an optical element and a pair of glasses that incorporate such a patch.
  • the power of an optical component may be useful to adapt the power of an optical component according to a particular use thereof. This may be the case, for example, to adapt a glass of sun protection glasses to the ametropia of a carrier of this glass.
  • the power of an optical component refers to the vergence of this element, and is commonly expressed in diopters.
  • the pellet includes a Fresnel lens which is formed of a series of Fresnel zones disposed one inside the other parallel to a smooth face of the pellet. These zones have jumps in height between two successive zones which are greater than five times an average wavelength of visible light, the jumps in height being measured in a direction perpendicular to the tangent of its smooth face.
  • the pellet itself has an optical power which results from the refraction of the light rays on both sides of the pellet in each Fresnel zone. This optical power of the chip is added to that of the optical component to which it is applied.
  • the use of a Fresnel lens shape reduces the thickness of the pad to achieve a fixed power change, compared to an additional lens that would be contiguous to the optical component.
  • pellets have an initial planar shape, and must be curved when applied to the curved surface of a lens or an ophthalmic lens. Such pellets are described in particular in US Patent 3,904,281.
  • This deformation of the pellet at the time of its application to the lens or to the ophthalmic lens creates distortions of an image formed through the lens or the glass, once the latter or lens is provided with the pellet, as well as optical aberrations.
  • the distortions of the image vary dynamically when the observed object moves in the field of view or when the wearer of the glass turns his head following the object of the gaze. These image distortions are very troublesome.
  • defects related either to diffusion and / or diffraction may appear in different areas of the pellet reinforcing the carrier gene and / or interfering with the cosmetic quality of the object, the latter being in particular identifiable by an observer placed in front of the wearer. These defects are all the more important that the change in optical power provided by the chip is high.
  • the passage of a power modification pad from a flat surface to a curved surface causes a dioptric defect.
  • the initial power of the tablet in planar form and the effective power of the tablet when applied to an optical component vary. This variation is highly detrimental to the quality of vision provided to a wearer.
  • An object of the present invention is to propose an optical power modification patch which does not have the drawbacks mentioned above, and which is easy to use.
  • the object of the present invention is to allow easy use by a simply and effortlessly wishing carrier, adapted the power of an ophthalmic lens type optical component to its personal visual correction, by simply applying the power modification patch to any optical equipment.
  • a solution to this technical problem consists in producing a Fresnel structure within a pellet having a spherical surface, said spherical surface being substantially identical to the spherical surface of the optical component intended to receive said pellet.
  • the object of the invention makes it possible to solve the problems of distortions, observed in the elements of the state of the art, during the passage from a flat surface to a curved surface. This is one of the features of the invention.
  • the present invention comprises a Fresnel zone power modification chip having a generally spherical shape in which the distribution profile of the Fresnel zones across their amplitude and their pitch is judiciously chosen: this selection makes it possible to confer on the OBJECT OF THE INVENTION For a given correction power and a diameter of the patch, elimination of the distortions as previously described and in particular a maintenance of the initial power of the chip during its application to an optical component.
  • the invention proposes a pellet of the type described above having a series of Fresnel zones on its concave spherical face, the pellet being intended to be fixed on a concave curved surface of an optical component to modify the power of this one.
  • modifying means either the contribution of an optical power to an optical component not comprising power, or a variation of the optical power to an optical component already comprising its own optical power.
  • the pellet has a generally spherical shape in addition to jumps in height that are present between the Fresnel zones, said Fresnel zones being present on the concave face of said chip, and the face of the chip coming into contact with the optical component being constituted by the smooth convex face of said chip.
  • the smooth convex face of the pellet has an initial curvature which corresponds substantially to the shape of the concave curved surface of the optical component intended to receive said pellet.
  • this smooth convex face of the pellet may have a cylindrical surface or a toric surface.
  • the tablet according to the invention makes it possible to take into account a correction of the astigmatism of a speaker.
  • an astigmatic surface is characterized by the fact that the two main meridians do not have the same radius of curvature.
  • the concave face of the pellet which comprises the jumps in height also has a mean curvature which also corresponds to said curved surface of the optical component, this face being intended to be in contact with the ambient environment.
  • the overall profile of the Fresnel structure on the whole of the pellet has a spherical geometry.
  • the term "optical component” means visors such as helmet visors and ophthalmic lenses; ophthalmic lenses means lenses that are suitable in particular for a spectacle frame or a mask such as a ski mask, a sun mask or a diving mask, as well as masks whose function is to protect the eye and / or to correct the view, these lenses being chosen from afocal, unifocal, bifocal or progressive addition lenses.
  • mask such as solar masks, is meant a lens consisting of a single piece and intended to be positioned in front of both eyes. Such ophthalmic lenses or visors may be optionally tinted.
  • optical components within the meaning of the invention may optionally have one or more functions that do not provide the application of one or more coatings and may especially be chosen from photochromic, anti-reflective, anti-fouling, anti-shock and anti-scratch coatings. , polarizing and antistatic.
  • the invention is particularly suitable for corrective or non-corrective ophthalmic lenses.
  • the curved power modification chip according to the invention consists of a material able to provide it with a cohesion with the optical component to which it must be bonded, this cohesion being either natural and due to the intrinsic properties of the sticky material (also called “ tack "or” tackiness "in English), or initiated through the deposition of a thin layer of water, which serves as a vector for initiating and facilitating the bringing into contact between the pellet and the optical component.
  • the present invention thus comprises a wafer intended to be fixed on a curved concave surface of an optical component for modifying an optical power of said component, the wafer comprising a Fresnel lens formed of a series of Fresnel zones arranged at the same time.
  • the tablet being characterized in that it has: a general spherical shape in addition to jumps in height between successive Fresnel zones, said generally spherical shape having an average radius of curvature of between 135 mm and 53 mm, and in which the jumps in height between successive Fresnel zones are located on a concave face of the patch, said jumps in height between zones of successive Fresnel presenting:
  • variable amplitudes which increase in a peripheral part of the patch, away from the optical center (O) outside said circle (C),
  • the pellet has a generally spherical shape comprising an average radius of curvature of between 88 mm and 53 mm, and very preferably substantially equal to 66 mm.
  • This average radius of curvature of 66 mm corresponds to a basic ophthalmic lens 8, this base being preferably implemented for the production of ophthalmic lenses of solar type, that is to say comprising a filter function. These ophthalmic lenses of solar type conventionally have a visible transmission rate of 88% and 6%. Such ophthalmic lenses meet the category 1 to 4 filter criteria according to the international classification used to classify sunscreens.
  • the jumps in height between successive Fresnel zones have constant amplitudes within an area surrounding the optical center of the patch.
  • the concave face of the pellet which comprises the jumps in height then has a constant height of reliefs in a central part of this face. This helps to specifically limit the diffraction in the center of the pellet.
  • the jumps in height between successive Fresnel zones outside this central zone surrounding the optical center mentioned above have variable amplitudes up to the outer edge of said patch, this type of specific profile. to limit the diffusion in this area of the power pellet.
  • the adjustment of the dimensioning of the constant amplitude in a central zone and of the variable amplitude in an area external to this central zone is chosen according to the power and the diameter of the power modification patch, these two parameters being themselves adjusted according to the personal visual correction of a wearer and his choice of the optical component on which he wishes to adapt the object of the present invention.
  • the invention also relates to an optical element which comprises a basic optical component and a patch as described above, fixed on the concave rear face of the component by means of its smooth convex face.
  • the basic optical component may be an ophthalmic lens.
  • such an ophthalmic lens is tinted or partially reflective and optionally has optical properties capable of correcting an ametropia.
  • the pellet is then little visible and does not reduce the aesthetics of a pair of glasses that includes the lens, when applied to the concave or posterior face of the lens.
  • the specific distribution profile of the constant and variable amplitudes of the Fresnel zones in the pellet according to the invention thus makes it possible to greatly improve the aesthetics of the device, particularly by minimizing the physical effects of diffraction and scattering of light rays. These are indeed not only troublesome for comfort and optical quality provides the wearer, but also disturbing for an observer placed in front of the wearer.
  • the invention also relates to a pair of spectacles which comprises at least one lens and a patch as described above, which is fixed on the lens.
  • a pair of spectacles may be of the type of ametropia corrective glasses, tinted or not, or glasses or non-corrective sun protection mask, in particular.
  • FIG. 1a is a perspective view of a pellet according to the invention.
  • FIG. 1b is a sectional view of a pellet according to the invention.
  • FIG. 2a is a sectional view of an ophthalmic lens, adapted to be adapted to a pair of glasses, provided with pellets according to Figure 1b;
  • FIG. 3 is a diagram illustrating variations in height jumps for a tablet according to the invention.
  • a tablet 1 according to the invention has a generally spherical shape, or cup.
  • the pellet has a spherical cap shape, with an average radius of curvature which may be of the order of 66 mm (millimeters) for example.
  • Such a radius of curvature corresponds to the shape of the posterior face, or concave face, of many ophthalmic spectacle lenses.
  • the pellets have an average radius of curvature of between 135 mm and 53 mm, advantageously between 88 mm and 53 mm.
  • the pellet 1 constitutes a Fresnel lens: it is formed of a succession of Fresnel zones which are concentrically arranged contiguously, for example 100 to 200 zones. These zones, referenced 2 in the figures are coaxial crowns which are oriented and centered along an optical axis marked z. The z axis then passes through an optical center of the pellet, which is located thereon and is denoted by O.
  • each Fresnel zone corresponds to a lens portion, and the thickness of the pellet 1 varies. continuously within this zone in a radial direction, denoted r, in a plane perpendicular to the z axis.
  • one of the surfaces of the pellet 1 has a height jump parallel to the z axis, referenced 3. Its amplitude is noted ⁇ z. It is specified that the jumps in height 3 that are present between successive zones 2 are superimposed on the general shape of the pellet 1, this general shape being curved, according to the invention.
  • the jumps of height 3 correspond to discontinuities in height of the concave face of the pellet 1, referenced S1, the latter being intended to remain in contact with the surrounding medium.
  • a Fresnel zone 2 has a radial dimension which is denoted ⁇ r, measured perpendicular to the z axis.
  • e denotes the average thickness of the pellet 1, between the faces S1 and S2. It is measured perpendicular to the S2 face.
  • the average thickness e is between 2 mm (millimeters) and 0.5 mm. This small thickness of the pellet limits the thickness of the optical element, and thus maintain the aesthetics of the object.
  • the amount of material added to the optical component being low, this makes it possible to limit the total weight of the optical element.
  • the Fresnel zones 2 are dimensioned so that the amplitudes ⁇ z of the jumps of height 3 are at least equal to five. times an average wavelength of visible light. Moreover, these Fresnel zones are distributed according to constant and variable amplitudes ⁇ z as a function of their positioning with respect to the optical center (O) of the pellet. In a global manner, the amplitudes of jumps in height 3 are between 5 ⁇ m (micrometers) and 250 ⁇ m.
  • the pellet 1 has a purely refractive optical effect, which is related to the shape of the surfaces S1 and S2 in each zone 2, and produces no visible diffractive effect.
  • the amplitudes of the jumps of height 3 between successive Fresnel zones are constant over a central portion (C) and variable over a portion of the surface of the chip extending outside the circle (C) to a peripheral part, while maintaining a substantially spherical profile on the surface (S1).
  • the amplitude ⁇ z is greater at the periphery of the pellet than in its central zone.
  • the pellet is such that the jumps in height (3) between successive Fresnel zones inside the circle (C) have amplitudes of between 5 ⁇ m and 25 ⁇ m, and the jumps in height (3). ) between successive Fresnel zones at the outside of the circle (C) to a peripheral portion of the pellet have variable amplitudes of between 5 ⁇ m and 250 ⁇ m.
  • the patch is such that the jumps in height (3) between successive Fresnel zones inside the circle (C) have amplitudes of between 10 ⁇ m and 20 ⁇ m,
  • the pellet may have in its outer peripheral peripheral edge a third peripheral zone defines (A) in Figure 1b, including jumps of constant heights.
  • This peripheral zone is sometimes called a non-useful zone. Indeed it is known to those skilled in the art that the optically useful area covers the entire lens which has a limited diameter.
  • a peripheral zone is provided on the periphery of the ophthalmic lens. This zone is said peripheral because it does not meet the conditions of optical correction prescribed and has defects of obliquities. The defects of this peripheral zone do not affect the visual comfort of the wearer because this area is outside the field of view of the wearer.
  • the pellet is such that the jumps in height (3) between successive Fresnel zones in the peripheral zone (A) have constant amplitudes said amplitude corresponding to the amplitude of the last jump of height (3) between successive Fresnel zones outside the circle (C), and a constant dimension ( ⁇ r) corresponding to the constant dimension ( ⁇ r) between successive Fresnel zones outside the circle (C)
  • the radial dimension ⁇ r of each zone 2 then depends on the optical power of the pellet 1 and the amplitude ⁇ z of the height jumps 3.
  • ⁇ r can be between 100 microns and 5 mm.
  • the pellet is such that the Fresnel zones (2) have a dimension ( ⁇ r) variable between 5 mm and 100 ⁇ m inside the circle (C), the largest dimension being closer to the center (O) of the circle (C), and the Fresnel zones (2) have a constant dimension ( ⁇ r) of between 500 ⁇ m and 100 ⁇ m outside the circle (C).
  • the pellet according to the invention is such that the Fresnel zones (2) have a variable size ( ⁇ r) of between 2.5 mm and 250 ⁇ m inside the circle (C), the most large dimension is closest to the center (O) of the circle (C), and the Fresnel zones (2) have a constant dimension ( ⁇ r) of 250 ⁇ m outside the circle (C).
  • the pellet 1 may have a positive or negative vergence, depending on the direction of variation of its thickness along the direction r, within each Fresnel zone 2.
  • FIG. 1b corresponds to a convergent pellet.
  • the variation of the thickness of the pellet inside each zone 2 may be, in particular, a quadratic function of r.
  • the tablet according to the invention may also have a cylinder, which then makes it possible to take into account the astigmatism of the wearer if necessary.
  • the pellet is such that the smooth convex front face of said pellet has a cylindrical surface or a toric surface.
  • FIG. 2a shows an ophthalmic lens adaptable to a pair of spectacles which are provided, on their posterior faces SO, or concave faces, with pellets according to FIG. 1b.
  • the lens of FIG. 2a, referenced 10 may be a sun protection lens with zero optical power, since it has two parallel faces.
  • the pellet 1 then gives it a non-zero power, which corrects a lack of ametropia and possibly astigmatism of a wearer of the lens.
  • the patch 1 makes it possible to adapt any sun protection lens to a wearer having a visual distortion.
  • the pair of spectacles comprising such a lens 10 may then be chosen by the wearer according to his aesthetics, his color, or the shape of the associated frame.
  • the lens of Figure 2a corresponds to a correction of myopia, since it is thinner at its center than at its periphery.
  • the pellet 1 then allows to adapt the strength of the correction according to the degree of myopia of the wearer.
  • the tablet 1 is placed on the glass 10 so as to superpose the respective optical axes of the glass and the tablet.
  • An identical function is obtained with a corrective lens of hyperopia.
  • the pellet 1 is applied to the posterior surface SO of the lens 10 which is smooth. This operation can be done directly by the practitioner or the wearer on the pair of glasses in which the lens is mounted on the frame chosen by the wearer.
  • FIG. 3 represents an example of variation of the amplitudes ⁇ z of the jumps of height 3 along the radial direction r.
  • r is smaller than radius
  • the amplitudes ⁇ z of the jumps 3 are constant and the radial dimension ⁇ r of the zones 2 decreases for zones 2 of larger and larger. Beyond the value Rc, that is to say in a peripheral portion of the pellet 1 outside the circle C, the jumps of height 3 have amplitudes ⁇ z which increase.
  • the pellet 1 is adhered to the face SO of the lens 10, thanks to the intrinsic adhesion properties of the material constituting said pellet, or possibly by using a thin film of water between the two interfaces, which serves as vector to initiate contact between elements.
  • the material constituting the pellet must combine both transparency properties that make it possible to preserve the optical quality of the optical component intended to receive it, the "tack" properties, as well as the physical properties enabling it to be conferred. a certain flexibility in order to adapt it in a manner to the radius of curvature of the optical component to wear it.
  • the material constituting the pellet according to the invention has a hardness of between 70 and 95 shore A, a diffusion of between 2.0% and 0.4%, preferably less than 1%.
  • thermoplastic materials chosen from polyurethane polymers, polyvinyl chloride, polyethylene terephthalate polymers, poly (meth) acrylate polymers and polycarbonate polymers.
  • constituent material of the pellet is selected from thermoplastic polyurethane and thermoplastic polyvinyl chloride.
  • the material of the ophthalmic lens can be of mineral or organic type.
  • organic material that can be used in the context of the invention the materials conventionally used in optics and ophthalmia.
  • substrates of the polycarbonate type are suitable; polyamide; polyimides; polysulfones; copolymers of poly (ethylene terephthalate) and polycarbonate; polyolefins, especially polynorbornenes; polymers and copolymers of diethylene glycol bis (allyl carbonate); (meth) acrylic polymers and copolymers, especially polymers and (meth) acrylic copolymers derived from bisphenol-A; thio (meth) acrylic polymers and copolymers; urethane and thiourethane polymers and copolymers; epoxy polymers and copolymers and episulfide polymers and copolymers.

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  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Ophthalmology & Optometry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • General Health & Medical Sciences (AREA)
  • Eyeglasses (AREA)

Abstract

Disc designed to be attached to a concave curved surface of an optical component to modify an optical power of said component, the disc comprising a Fresnel lens made up of a series of Fresnel regions of spherical general shape, in which the changes of height between successive Fresnel regions are located on a concave face of the disc, and in which said Fresnel regions are made out in a special distribution. A disc of this kind maintains the dioptric quality without introducing distortions.

Description

PASTILLE COURBE DE MODIFICATION D'UNE PUISSANCE D'UN PASTILLE CURVE MODIFYING A POWER OF A
COMPOSANT OPTIQUEOPTICAL COMPONENT
La présente invention concerne une pastille courbe destinée à être fixée sur une face concave d'un composant optique pour modifier une puissance optique de celui-ci. Elle concerne aussi un élément optique et une paire de lunettes qui incorporent une telle pastille.The present invention relates to a curved patch for attachment to a concave face of an optical component for modifying an optical power thereof. It also relates to an optical element and a pair of glasses that incorporate such a patch.
Il peut être utile d'adapter la puissance d'un composant optique en fonction d'une utilisation particulière de celui-ci. Ce peut être le cas, par exemple, pour adapter un verre de lunettes de protection solaire à l'amétropie d'un porteur de ce verre. Dans le cadre de l'invention, la puissance d'un composant optique désigne la vergence de cet élément, et est couramment exprimée en dioptries.It may be useful to adapt the power of an optical component according to a particular use thereof. This may be the case, for example, to adapt a glass of sun protection glasses to the ametropia of a carrier of this glass. In the context of the invention, the power of an optical component refers to the vergence of this element, and is commonly expressed in diopters.
Il est connu de réaliser une pastille en matériau transparent qui est destinée à être appliquée sur une face d'un composant optique, pour modifier la puissance de ce dernier. La pastille comprend une lentille de Fresnel qui est formée d'une série de zones de Fresnel disposées les unes à l'intérieur des autres parallèlement à une face lisse de la pastille. Ces zones présentent des sauts de hauteur entre deux zones successives qui sont plus grands que cinq fois une longueur d'onde moyenne de lumière visible, les sauts de hauteur étant mesurés selon une direction perpendiculaire à la tangente de Sa face lisse. Dans ces conditions, la pastille possède elle-même une puissance optique qui résulte de la réfraction des rayons lumineux sur les deux faces de la pastille dans chaque zone de Fresnel. Cette puissance optique de la pastille s'ajoute à celle du composant optique sur lequel elle est appliquée. L'utilisation d'une forme de lentille de Fresnel réduit l'épaisseur de la pastille pour obtenir une modification de puissance fixée, par rapport à une lentille additionnelle qui serait accolée au composant optique.It is known to make a pellet of transparent material which is intended to be applied on one side of an optical component, to modify the power of the latter. The pellet includes a Fresnel lens which is formed of a series of Fresnel zones disposed one inside the other parallel to a smooth face of the pellet. These zones have jumps in height between two successive zones which are greater than five times an average wavelength of visible light, the jumps in height being measured in a direction perpendicular to the tangent of its smooth face. Under these conditions, the pellet itself has an optical power which results from the refraction of the light rays on both sides of the pellet in each Fresnel zone. This optical power of the chip is added to that of the optical component to which it is applied. The use of a Fresnel lens shape reduces the thickness of the pad to achieve a fixed power change, compared to an additional lens that would be contiguous to the optical component.
Ces pastilles possèdent une forme initiale plane, et doivent être courbées lorsqu'elles sont appliquées sur la surface courbe d'une lentille ou d'un verre ophtalmique. De telles pastilles sont notamment décrites dans le brevet US 3,904,281. Cette déformation de la pastille au moment de son application sur la lentille ou sur le verre ophtalmique crée des distorsions d'une image formée à travers la lentille ou le verre, une fois que celle-ci ou celui-ci est muni(e) de la pastille, ainsi que des aberrations optiques. En particulier, les distorsions de l'image varient dynamiquement lorsque l'objet observé se déplace dans le champ de vision ou lorsque le porteur du verre tourne la tête en suivant l'objet du regard. Ces distorsions d'image sont alors très gênantes. De plus des défauts liés soit à la diffusion et/ou à la diffraction peuvent apparaître dans différentes zones de la pastille renforçant la gène du porteur et/ou interférant avec la qualité cosmétique de l'objet celle-ci étant notamment identifiable par un observateur placé en face du porteur. Ces défauts sont d'autant plus importants que la modification de puissance optique apportée par la pastille est élevée. Enfin on a pu constater que le passage d'une pastille de modification de puissance d'une surface plane à une surface courbe entraîne un défaut dioptrique. Ainsi la puissance initiale de la pastille sous forme plane et la puissance effective de la pastille une fois appliquée sur un composant optique varient. Cette variation est fortement préjudiciable à la qualité de vision apportée à un porteur. Un but de la présente invention est de proposer une pastille de modification de puissance optique qui ne présente pas les inconvénients cités ci-dessus, et qui soit simple d'utilisation Ainsi l'objet de la présente invention doit permettre un emploi aisé, par un porteur souhaitant simplement et sans effort, adapté la puissance d'un composant optique de type lentille ophtalmique à sa correction visuelle personnelle, par simple application de la pastille de modification de puissance à tout équipement optique.These pellets have an initial planar shape, and must be curved when applied to the curved surface of a lens or an ophthalmic lens. Such pellets are described in particular in US Patent 3,904,281. This deformation of the pellet at the time of its application to the lens or to the ophthalmic lens creates distortions of an image formed through the lens or the glass, once the latter or lens is provided with the pellet, as well as optical aberrations. In particular, the distortions of the image vary dynamically when the observed object moves in the field of view or when the wearer of the glass turns his head following the object of the gaze. These image distortions are very troublesome. In addition, defects related either to diffusion and / or diffraction may appear in different areas of the pellet reinforcing the carrier gene and / or interfering with the cosmetic quality of the object, the latter being in particular identifiable by an observer placed in front of the wearer. These defects are all the more important that the change in optical power provided by the chip is high. Finally it has been found that the passage of a power modification pad from a flat surface to a curved surface causes a dioptric defect. Thus, the initial power of the tablet in planar form and the effective power of the tablet when applied to an optical component vary. This variation is highly detrimental to the quality of vision provided to a wearer. An object of the present invention is to propose an optical power modification patch which does not have the drawbacks mentioned above, and which is easy to use. Thus, the object of the present invention is to allow easy use by a simply and effortlessly wishing carrier, adapted the power of an ophthalmic lens type optical component to its personal visual correction, by simply applying the power modification patch to any optical equipment.
Une solution à ce problème technique consiste à réaliser une structure de Fresnel au sein d'une pastille présentant une surface sphérique, ladite surface sphérique étant sensiblement identique à la surface sphérique du composant optique destinée à recevoir ladite pastille. Dans une telle configuration, l'objet de l'invention permet de résoudre les problèmes de distorsions, observés dans les éléments de l'état de l'art, lors du passage d'une surface plane à une surface courbe. Ceci constitue une des caractéristiques de l'invention.A solution to this technical problem consists in producing a Fresnel structure within a pellet having a spherical surface, said spherical surface being substantially identical to the spherical surface of the optical component intended to receive said pellet. In such a configuration, the object of the invention makes it possible to solve the problems of distortions, observed in the elements of the state of the art, during the passage from a flat surface to a curved surface. This is one of the features of the invention.
Pour adapter au mieux la pastille de modification de puissance, il est nécessaire de prendre en compte la courbure du composant optique destiné à recevoir ladite pastille, lors de la conception du profil de la structure de Fresnel de la pastille. Toutefois un tel dispositif de modification de puissance peut présenter des défauts optiques dus d'une part à la diffraction et d'autre part à la diffusion selon les zones considérées de ladite pastille. Ces différentes problématiques trouvent une solution globale au sein de l'objet de la présente invention. Ainsi la présente invention comprend une pastille de modification de puissance à zones de Fresnel présentant un forme générale sphérique dans laquelle le profil de distribution des zones de Fresnel au travers de leur amplitude et de leur pas est judicieusement choisit: cette sélection permet de conférer à l'objet de l'invention, pour une puissance de correction donnée et un diamètre de la pastille établit, une élimination des distorsions telles que précédemment décrites et notamment un maintien de la puissance initiale de la pastille lors de son application sur un composant optique. De plus cette distribution spécifique des zones de Fresnel au sein de la pastille permet une minimisation de la diffraction dans une zone central de l'objet et une minimisation de la diffusion dans une zone non centrale de la pastille, cette dernière pouvant notamment être induite du fait de la limitation de résolution des outils et dispositifs permettant de réaliser de telles structures..To better adapt the power modification chip, it is necessary to take into account the curvature of the optical component intended to receive said chip, during the design of the profile of the Fresnel structure of the chip. However, such a power modification device may have optical defects due firstly to the diffraction and secondly to the diffusion according to the considered zones of said pellet. These various problems find a global solution within the object of the present invention. Thus, the present invention comprises a Fresnel zone power modification chip having a generally spherical shape in which the distribution profile of the Fresnel zones across their amplitude and their pitch is judiciously chosen: this selection makes it possible to confer on the OBJECT OF THE INVENTION For a given correction power and a diameter of the patch, elimination of the distortions as previously described and in particular a maintenance of the initial power of the chip during its application to an optical component. In addition, this specific distribution of the Fresnel zones within the pellet makes it possible to minimize diffraction in a central zone of the object and to minimize diffusion in a non-central zone of the pellet, the latter being able to be induced in particular by makes of the limitation of the resolution of the tools and devices making it possible to realize such structures.
Pour cela, l'invention propose une pastille du type décrit ci-dessus présentant une série de zones de Fresnel sur sa face concave sphérique, la pastille étant destinée à être fixée sur une surface courbe concave d'un composant optique pour modifier la puissance de celui-ci. Par modifier on entend soit l'apport d'une puissance optique à un composant optique ne comprenant pas de puissance, soit une variation de la puissance optique à un composant optique comprenant déjà sa propre puissance optique. Ainsi selon l'invention, la pastille possède une forme généralement sphérique en plus des sauts de hauteur qui sont présents entre les zones de Fresnel, lesdites zones de Fresnel étant présentes sur la face concave de ladite pastille, et la face de la pastille entrant en contact avec le composant optique étant constitué par la face convexe lisse de ladite pastille. Autrement dit, la face convexe lisse de la pastille possède une courbure initiale qui correspond sensiblement à la forme de la surface courbe concave du composant optique destiné à recevoir ladite pastille. Selon un mode de réalisation particulier de l'invention cette face convexe lisse de la pastille peut présenter une surface cylindrique ou une surface torique. Dans un tel mode de réalisation, la pastille selon l'invention permet de prendre en compte une correction de l'astigmatisme d'un prteur. En effet une surface astigmate est caractérisée par le fait que les deux méridiens principaux n'ont pas le même rayon de courbure.For this, the invention proposes a pellet of the type described above having a series of Fresnel zones on its concave spherical face, the pellet being intended to be fixed on a concave curved surface of an optical component to modify the power of this one. By modifying means either the contribution of an optical power to an optical component not comprising power, or a variation of the optical power to an optical component already comprising its own optical power. Thus according to the invention, the pellet has a generally spherical shape in addition to jumps in height that are present between the Fresnel zones, said Fresnel zones being present on the concave face of said chip, and the face of the chip coming into contact with the optical component being constituted by the smooth convex face of said chip. In other words, the smooth convex face of the pellet has an initial curvature which corresponds substantially to the shape of the concave curved surface of the optical component intended to receive said pellet. According to a particular embodiment of the invention this smooth convex face of the pellet may have a cylindrical surface or a toric surface. In such an embodiment, the tablet according to the invention makes it possible to take into account a correction of the astigmatism of a speaker. Indeed an astigmatic surface is characterized by the fact that the two main meridians do not have the same radius of curvature.
La face concave de la pastille qui comporte les sauts de hauteur possède également une courbure moyenne qui correspond aussi à ladite surface courbe du composant optique, cette face étant destinée à être en contact avec le milieu ambiant. Ainsi le profil global de la structure de Fresnel sur l'ensemble de la pastille présente une géométrie sphérique.The concave face of the pellet which comprises the jumps in height also has a mean curvature which also corresponds to said curved surface of the optical component, this face being intended to be in contact with the ambient environment. Thus the overall profile of the Fresnel structure on the whole of the pellet has a spherical geometry.
Au sens de l'invention on entend par composant optique les visières tels que les visières de casque et les lentilles ophtalmiques ; par lentilles ophtalmiques, on entend les lentilles s'adaptant notamment à une monture de lunette ou à un masque tel qu'un masque de ski, un masque solaire ou un masque de plongée, ainsi que les masques ayant pour fonction de protéger l'œil et/ou de corriger la vue, ces lentilles étant choisies parmi les lentilles afocales, unifocales, bifocales ou à addition progressive. Par masque, tel que les masques solaires, on entend une lentille constituée d'une seule pièce et destinée à être positionnée devant les deux yeux. De telles lentilles ophtalmiques ou visières peuvent être éventuellement teintées. Ces composants optiques au sens de l'invention peuvent optionnellement présenter une ou plusieurs fonctions apporter pas l'application d'un ou plusieurs revêtements et pouvant notamment être choisi parmi les revêtements photochromiques, anti-reflets, antisalissures, anti-chocs, anti-rayures, polarisants et antistatiques. L'invention est particulièrement adaptée aux lentilles ophtalmiques correctrices ou non correctrices. La pastille courbe de modification de puissance selon l'invention est constitué d'un matériau apte à lui procurer une cohésion avec le composant optique auquel elle doit être liée, cette cohésion étant soit naturelle et due aux propriétés intrinsèques collante du matériau (aussi dénommé "tack" ou "tackiness" en anglais), soit initiée au travers le dépôt d'une fine couche d'eau, celle-ci servant de vecteur pour initier et faciliter la mise en contact entre la pastille et le composant optique.For the purposes of the invention, the term "optical component" means visors such as helmet visors and ophthalmic lenses; ophthalmic lenses means lenses that are suitable in particular for a spectacle frame or a mask such as a ski mask, a sun mask or a diving mask, as well as masks whose function is to protect the eye and / or to correct the view, these lenses being chosen from afocal, unifocal, bifocal or progressive addition lenses. By mask, such as solar masks, is meant a lens consisting of a single piece and intended to be positioned in front of both eyes. Such ophthalmic lenses or visors may be optionally tinted. These optical components within the meaning of the invention may optionally have one or more functions that do not provide the application of one or more coatings and may especially be chosen from photochromic, anti-reflective, anti-fouling, anti-shock and anti-scratch coatings. , polarizing and antistatic. The invention is particularly suitable for corrective or non-corrective ophthalmic lenses. The curved power modification chip according to the invention consists of a material able to provide it with a cohesion with the optical component to which it must be bonded, this cohesion being either natural and due to the intrinsic properties of the sticky material (also called " tack "or" tackiness "in English), or initiated through the deposition of a thin layer of water, which serves as a vector for initiating and facilitating the bringing into contact between the pellet and the optical component.
La présente invention comprend ainsi une pastille destinée à être fixée sur une surface courbe concave d'un composant optique pour modifier une puissance optique dudit composant, la pastille comprenant une lentille de Fresnel formée d'une série de zones de Fresnel disposées les unes à l'intérieur des autres parallèlement à une face lisse de ladite pastille et présentant des sauts de hauteur entre deux zones successives, lesdits sauts de hauteur étant mesurés selon une direction (z) perpendiculaire à la face lisse en un centre optique de la pastille (O), la pastille étant caractérisée en ce qu'elle possède: - une forme générale sphérique en plus des sauts de hauteur entre zones de Fresnel successives, ladite forme générale sphérique présentant un rayon de courbure moyen compris entre 135 mm et 53 mm, - et dans laquelle les sauts de hauteur entre zones de Fresnel successives sont situés sur une face concave de la pastille, lesdits sauts de hauteur entre zones de Fresnel successives présentant:The present invention thus comprises a wafer intended to be fixed on a curved concave surface of an optical component for modifying an optical power of said component, the wafer comprising a Fresnel lens formed of a series of Fresnel zones arranged at the same time. the interior of the others parallel to a smooth face of said wafer and having jumps in height between two successive zones, said height jumps being measured in a direction (z) perpendicular to the smooth face at an optical center of the wafer (O) , the tablet being characterized in that it has: a general spherical shape in addition to jumps in height between successive Fresnel zones, said generally spherical shape having an average radius of curvature of between 135 mm and 53 mm, and in which the jumps in height between successive Fresnel zones are located on a concave face of the patch, said jumps in height between zones of successive Fresnel presenting:
- des amplitudes constantes à l'intérieur d'un cercle de rayon (C) entourant le centre optique de la pastille (O) et de dimension définit en fonction de la puissance de la pastille,constant amplitudes inside a circle of radius (C) surrounding the optical center of the pellet (O) and of size defined as a function of the power of the pellet,
- et des amplitudes variables qui augmentent dans une partie périphérique de la pastille, en s'éloignant du centre optique (O) à l'extérieur dudit cercle (C),and variable amplitudes which increase in a peripheral part of the patch, away from the optical center (O) outside said circle (C),
- ledit cercle de rayon (C) présentant une valeur comprise entre 5 mm et 25 mm pour une puissance comprise entre 1 dioptrie et 10 dioptries, et une première amplitude centrale de saut de hauteur supérieure ou égale à 5μm. Selon un mode préférentielle de l'invention, la pastille présente une forme générale sphérique comprenant un rayon de courbure moyen compris entre 88 mm et 53 mm, et très préférentiellement sensiblement égale à 66 mm.said circle of radius (C) having a value of between 5 mm and 25 mm for a power comprised between 1 diopter and 10 diopters, and a first central amplitude of jump of height greater than or equal to 5 μm. According to a preferred embodiment of the invention, the pellet has a generally spherical shape comprising an average radius of curvature of between 88 mm and 53 mm, and very preferably substantially equal to 66 mm.
Ce rayon de courbure moyen de 66 mm correspond à une lentille ophtalmique de base 8, cette base étant de façon préférentielle mise en œuvre pour la réalisation de lentille ophtalmiques de type solaire, c'est-à-dire comprenant une fonction de filtre. Ces lentilles ophtalmiques de type solaire présentent classiquement un taux de transmission dans le visible compris 88% et 6%. De telles lentilles ophtalmiques répondent aux critères de filtre de catégorie 1 à 4 selon la classification internationale utilisée pour classifier les filtres solaires.This average radius of curvature of 66 mm corresponds to a basic ophthalmic lens 8, this base being preferably implemented for the production of ophthalmic lenses of solar type, that is to say comprising a filter function. These ophthalmic lenses of solar type conventionally have a visible transmission rate of 88% and 6%. Such ophthalmic lenses meet the category 1 to 4 filter criteria according to the international classification used to classify sunscreens.
Selon l'invention, les sauts de hauteur entre zones de Fresnel successives ont des amplitudes constantes à l'intérieur d'une zone entourant le centre optique de la pastille. La face concave de la pastille qui comporte les sauts de hauteur présente alors une hauteur de reliefs constante dans une partie centrale de cette face. Ceci contribue à limiter spécifiquement la diffraction au centre de la pastille. D'autre part selon une seconde caractéristique les sauts de hauteur entre zones de Fresnel successives à l'extérieure de cette zone central entourant le centre optique précédemment mentionnée, présentent des amplitudes variables jusqu'au bord externes de ladite pastille, ce type de profil spécifique permettant de limiter la diffusion dans cette zone de la pastille de puissance. L'ajustement du dimensionnement de l'amplitude constante dans une zone centrale et de l'amplitude variable dans une zone externe à cette zone centrale est choisit en fonction de la puissance et du diamètre de la pastille de modification de puissance, ces deux paramètres étant eux-mêmes ajustés en fonction de la correction visuelle personnelle d'un porteur et de son choix du composant optique sur lequel il souhaite adapter l'objet de la présente invention.According to the invention, the jumps in height between successive Fresnel zones have constant amplitudes within an area surrounding the optical center of the patch. The concave face of the pellet which comprises the jumps in height then has a constant height of reliefs in a central part of this face. This helps to specifically limit the diffraction in the center of the pellet. On the other hand, according to a second characteristic, the jumps in height between successive Fresnel zones outside this central zone surrounding the optical center mentioned above have variable amplitudes up to the outer edge of said patch, this type of specific profile. to limit the diffusion in this area of the power pellet. The adjustment of the dimensioning of the constant amplitude in a central zone and of the variable amplitude in an area external to this central zone is chosen according to the power and the diameter of the power modification patch, these two parameters being themselves adjusted according to the personal visual correction of a wearer and his choice of the optical component on which he wishes to adapt the object of the present invention.
L'invention concerne aussi un élément optique qui comprend un composant optique de base et une pastille telle que décrite précédemment, fixée sur la face arrière concave du composant au moyen de sa face convexe lisse. Comme décrit précédemment le composant optique de base peut être une lentille ophtalmique. De préférence, une telle lentille ophtalmique est teintée ou partiellement réfléchissante et présente éventuellement des propriétés optiques aptes à corriger une amétropie. La pastille est alors peu visible et ne réduit pas l'esthétisme d'une paire de lunettes qui comprend la lentille, lorsqu'elle est appliquée sur la face concave, ou face postérieure, de la lentille. Le profil de distribution spécifique des amplitudes constantes et variables des zones de Fresnel dans la pastille selon l'invention permet ainsi d'améliorer fortement l'esthétisme du dispositif, par minimisation notamment des effets physiques de diffraction et de diffusion des rayons lumineux. Ces derniers sont en effet non seulement gênants pour le confort et la qualité optique fournit au porteur, mais également perturbant pour un observateur placé en face du porteur.The invention also relates to an optical element which comprises a basic optical component and a patch as described above, fixed on the concave rear face of the component by means of its smooth convex face. As previously described, the basic optical component may be an ophthalmic lens. Preferably, such an ophthalmic lens is tinted or partially reflective and optionally has optical properties capable of correcting an ametropia. The pellet is then little visible and does not reduce the aesthetics of a pair of glasses that includes the lens, when applied to the concave or posterior face of the lens. The specific distribution profile of the constant and variable amplitudes of the Fresnel zones in the pellet according to the invention thus makes it possible to greatly improve the aesthetics of the device, particularly by minimizing the physical effects of diffraction and scattering of light rays. These are indeed not only troublesome for comfort and optical quality provides the wearer, but also disturbing for an observer placed in front of the wearer.
L'invention concerne aussi une paire de lunettes qui comprend au moins une lentille et une pastille telle que décrite précédemment, qui est fixée sur la lentille. Une telle paire de lunettes peut être du type lunettes correctrices d'amétropie teintées ou non, ou lunettes ou masque de protection solaire non correctrice, en particulier.The invention also relates to a pair of spectacles which comprises at least one lens and a patch as described above, which is fixed on the lens. Such a pair of spectacles may be of the type of ametropia corrective glasses, tinted or not, or glasses or non-corrective sun protection mask, in particular.
D'autres particularités et avantages de la présente invention apparaîtront dans la description ci-après d'exemples de réalisation non limitatifs, en référence aux dessins annexés, dans lesquels :Other features and advantages of the present invention will become apparent in the following description of nonlimiting exemplary embodiments, with reference to the appended drawings, in which:
- la figure 1 a est une vue en perspective d'une pastille selon l'invention ;- Figure 1a is a perspective view of a pellet according to the invention;
- la figure 1 b est une vue en coupe d'une pastille selon l'invention ;- Figure 1b is a sectional view of a pellet according to the invention;
- la figures 2a est une vue en coupe d'une lentille ophtalmique, apte à être adaptée à une paire de lunettes, munies de pastilles conformes à la figure 1 b;- Figure 2a is a sectional view of an ophthalmic lens, adapted to be adapted to a pair of glasses, provided with pellets according to Figure 1b;
- la figure 3 est un diagramme illustrant des variations de sauts de hauteur pour une pastille selon l'invention ;FIG. 3 is a diagram illustrating variations in height jumps for a tablet according to the invention;
Pour raison de clarté, les dimensions des éléments représentés ne sont pas en proportion avec des dimensions ou des rapports de dimensions réels. En outre des références identiques sur des figures différentes désignent des éléments identiques.For the sake of clarity, the dimensions of the elements shown are not in proportion to dimensions or dimensional ratios real. In addition, identical references in different figures designate identical elements.
Conformément aux figures 1a et 1b, une pastille 1 selon l'invention possède une forme générale sphérique, ou en coupelle. De préférence, la pastille a une forme de calotte sphérique, avec un rayon de courbure moyen qui peut être de l'ordre de 66 mm (millimètres) par exemple. Un tel rayon de courbure correspond à la forme de la face postérieure, ou face concave, de nombreuses lentilles ophtalmiques de lunettes. Dans le cadre de l'invention, les pastilles possèdent un rayon de courbure moyen compris entre 135 mm et 53 mm, avantageusement compris entre 88 mm et 53 mmAccording to Figures 1a and 1b, a tablet 1 according to the invention has a generally spherical shape, or cup. Preferably, the pellet has a spherical cap shape, with an average radius of curvature which may be of the order of 66 mm (millimeters) for example. Such a radius of curvature corresponds to the shape of the posterior face, or concave face, of many ophthalmic spectacle lenses. In the context of the invention, the pellets have an average radius of curvature of between 135 mm and 53 mm, advantageously between 88 mm and 53 mm.
La pastille 1 constitue une lentille de Fresnel : elle est formée d'une succession de zones de Fresnel qui sont disposées concentriquement de façon contiguë, par exemple 100 à 200 zones. Ces zones, référencées 2 sur les figures sont des couronnes coaxiales qui sont orientées et centrées selon un axe optique noté z. L'axe z passe alors par un centre optique de la pastille, qui est situé sur celle-ci et est noté O. De façon connue, chaque zone de Fresnel correspond à une portion de lentille, et l'épaisseur de la pastille 1 varie continûment à l'intérieur de cette zone selon une direction radiale, notée r, dans un plan perpendiculaire à l'axe z. Entre deux zones 2 successives, l'une des surfaces de la pastille 1 présente un saut de hauteur parallèle à l'axe z, référencé 3. Son amplitude est notée Δz. Il est précisé que les sauts de hauteur 3 qui sont présents entre des zones 2 successives sont superposés à la forme générale de la pastille 1 , cette forme générale étant bombée, selon l'invention. Les sauts de hauteur 3 correspondent à des discontinuités de hauteur de la face concave de la pastille 1 , référencée S1 , celle-ci étant destinée à rester en contact avec le milieu environnant. Entre deux sauts de hauteur 3 successifs, une zone de Fresnel 2 possède une dimension radiale qui est notée Δr, mesurée perpendiculairement à l'axe z. La face convexe de la pastille 1 , référencée S2, est alors lisse et est destinée à être mise en contact avec un composant optique afin de constituer un élément optique selon l'invention, e désigne l'épaisseur moyenne de la pastille 1 , entre les faces S1 et S2. Elle est mesurée perpendiculairement à la face S2. De préférence, l'épaisseur moyenne e est comprise entre 2 mm (millimètres) et 0,5 mm. Cette faible épaisseur de la pastille permet de limiter l'épaisseur de l'élément optique, et ainsi de maintenir l'esthétisme de l'objet. De plus la quantité de matière ajouté au composant optique étant faible cela permet de limiter le poids total de l'élément optique.The pellet 1 constitutes a Fresnel lens: it is formed of a succession of Fresnel zones which are concentrically arranged contiguously, for example 100 to 200 zones. These zones, referenced 2 in the figures are coaxial crowns which are oriented and centered along an optical axis marked z. The z axis then passes through an optical center of the pellet, which is located thereon and is denoted by O. In known manner, each Fresnel zone corresponds to a lens portion, and the thickness of the pellet 1 varies. continuously within this zone in a radial direction, denoted r, in a plane perpendicular to the z axis. Between two successive zones 2, one of the surfaces of the pellet 1 has a height jump parallel to the z axis, referenced 3. Its amplitude is noted Δz. It is specified that the jumps in height 3 that are present between successive zones 2 are superimposed on the general shape of the pellet 1, this general shape being curved, according to the invention. The jumps of height 3 correspond to discontinuities in height of the concave face of the pellet 1, referenced S1, the latter being intended to remain in contact with the surrounding medium. Between two successive jumps of height 3, a Fresnel zone 2 has a radial dimension which is denoted Δr, measured perpendicular to the z axis. The convex face of the pellet 1, referenced S2, is then smooth and is intended to be brought into contact with an optical component in order to constitute an optical element according to the invention, e denotes the average thickness of the pellet 1, between the faces S1 and S2. It is measured perpendicular to the S2 face. Preferably, the average thickness e is between 2 mm (millimeters) and 0.5 mm. This small thickness of the pellet limits the thickness of the optical element, and thus maintain the aesthetics of the object. In addition, the amount of material added to the optical component being low, this makes it possible to limit the total weight of the optical element.
Afin de minimiser la diffusion lumineuse, et la diffraction et ne provoquer aucune irisation, ou bien que ces phénomènes ne soient pas perceptibles, les zones de Fresnel 2 sont dimensionnées de sorte que les amplitudes Δz des sauts de hauteur 3 sont au moins égales à cinq fois une longueur d'onde moyenne de la lumière visible. De plus ces zones de Fresnel sont réparties selon des amplitudes Δz constantes et variables en fonction de leur positionnement par rapport au centre optique (O) de la pastille. D'une façon globale, les amplitudes des sauts de hauteur 3 sont comprises entre 5 μm (micromètres) et 250 μm. De cette façon, à cause de la courte longueur de cohérence de la lumière naturelle, aucune interférence qui se produirait entre des parties d'un faisceau lumineux qui traversent des zones 2 différentes, n'est perceptible. Autrement dit, la pastille 1 a un effet optique purement réfractif, qui est lié à la forme des surfaces S1 et S2 dans chaque zone 2, et n'engendre aucun effet diffractif visible. Comme décrit précédemment les amplitudes des sauts de hauteur 3 entre zones de Fresnel successives sont constantes sur une partie centrale (C) et variable sur une partie de la surface de la pastille s'étendant à l'extérieur du cercle (C) jusqu'à une partie périphérique, tout en conservant un profil sensiblement sphérique à la surface (S1 ). Dans cette configuration, l'amplitude Δz est plus importante à la périphérie de la pastille que dans sa zone centrale. Ainsi selon l'invention, la pastille est telle que les sauts de hauteur (3) entre zones de Fresnel successives à l'intérieur du cercle (C) ont des amplitudes comprises entre 5 μm et 25 μm, et les sauts de hauteur (3) entres zones de Fresnel successives à l'extérieur du cercle (C) jusqu'à une partie périphérique de Ia pastille ont des amplitudes variables comprises entre 5 μm et 250 μm.In order to minimize the light scattering, and the diffraction and to cause no iridescence, or that these phenomena are not perceptible, the Fresnel zones 2 are dimensioned so that the amplitudes Δz of the jumps of height 3 are at least equal to five. times an average wavelength of visible light. Moreover, these Fresnel zones are distributed according to constant and variable amplitudes Δz as a function of their positioning with respect to the optical center (O) of the pellet. In a global manner, the amplitudes of jumps in height 3 are between 5 μm (micrometers) and 250 μm. In this way, because of the short coherence length of natural light, no interference that would occur between portions of a light beam passing through different areas 2 is perceptible. In other words, the pellet 1 has a purely refractive optical effect, which is related to the shape of the surfaces S1 and S2 in each zone 2, and produces no visible diffractive effect. As previously described, the amplitudes of the jumps of height 3 between successive Fresnel zones are constant over a central portion (C) and variable over a portion of the surface of the chip extending outside the circle (C) to a peripheral part, while maintaining a substantially spherical profile on the surface (S1). In this configuration, the amplitude Δz is greater at the periphery of the pellet than in its central zone. Thus according to the invention, the pellet is such that the jumps in height (3) between successive Fresnel zones inside the circle (C) have amplitudes of between 5 μm and 25 μm, and the jumps in height (3). ) between successive Fresnel zones at the outside of the circle (C) to a peripheral portion of the pellet have variable amplitudes of between 5 μm and 250 μm.
D'une façon avantageuse, la pastille est telle que les sauts de hauteur (3) entre zones de Fresnel successives à l'intérieur du cercle (C) ont des amplitudes comprises entre 10 μm et 20 μm,Advantageously, the patch is such that the jumps in height (3) between successive Fresnel zones inside the circle (C) have amplitudes of between 10 μm and 20 μm,
Selon un mode de réalisation particulier de l'invention, la pastille peut présenter dans son bord périphérique latérale externe une troisième zone périphérique définit (A) sur la figure 1b, comprenant des sauts de hauteurs constants. Cette zone périphérique est parfois appelée zone non utile. En effet il est connu de l'homme de l'art que la zone optiquement utile couvre la totalité de la lentille qui présente un diamètre limité. Cependant dans certain cas, une zone périphérique est prévue sur les pourtours de la lentille ophtalmique. Cette zone est dite périphérique car elle ne répond pas aux conditions de correction optique prescrite et présente des défauts d'oblicités. Les défauts de cette zone périphérique ne nuisent pas au confort visuel du porteur car cette zone se situe en dehors du champ de vision du porteur. Cette zone dite périphérique (A) peut donc être prévue au sein de la pastille à modification de puissance et pour des raisons de réalisation et/ou d'esthétisme il peut être avantageux que cette dernière présente des zones de fresnel à amplitudes constantes. Ainsi selon ce mode de réalisation, la pastille est telle que les sauts de hauteur (3) entre zones de Fresnel successives dans la zone périphérique (A) ont des amplitudes constantes ladite amplitude correspondant à l'amplitude du dernier saut de hauteur (3) entre zones de Fresnel successives à l'extérieur du cercle (C), et une dimension (Δr) constante correspondant à la dimension (Δr) constante entre zones de Fresnel successives à l'extérieur du cercle (C)According to a particular embodiment of the invention, the pellet may have in its outer peripheral peripheral edge a third peripheral zone defines (A) in Figure 1b, including jumps of constant heights. This peripheral zone is sometimes called a non-useful zone. Indeed it is known to those skilled in the art that the optically useful area covers the entire lens which has a limited diameter. However in some cases, a peripheral zone is provided on the periphery of the ophthalmic lens. This zone is said peripheral because it does not meet the conditions of optical correction prescribed and has defects of obliquities. The defects of this peripheral zone do not affect the visual comfort of the wearer because this area is outside the field of view of the wearer. This so-called peripheral zone (A) can therefore be provided within the power-modifying chip and for reasons of embodiment and / or aesthetics it may be advantageous for the latter to present constant-amplitude fresnel zones. Thus according to this embodiment, the pellet is such that the jumps in height (3) between successive Fresnel zones in the peripheral zone (A) have constant amplitudes said amplitude corresponding to the amplitude of the last jump of height (3) between successive Fresnel zones outside the circle (C), and a constant dimension (Δr) corresponding to the constant dimension (Δr) between successive Fresnel zones outside the circle (C)
La dimension radiale Δr de chaque zone 2 dépend alors de la puissance optique de la pastille 1 et de l'amplitude Δz des sauts de hauteur 3.The radial dimension Δr of each zone 2 then depends on the optical power of the pellet 1 and the amplitude Δz of the height jumps 3.
Dans les conditions précédentes, et pour une puissance optique de la pastille 1 inférieure ou égale à 10 dioptries, Δr peut être comprise entre 100 μm et 5 mm. Selon l'invention, la pastille est telle que les zones de Fresnel (2) ont une dimension (Δr) variable comprise entre 5 mm et 100 μm à l'intérieure du cercle (C), la plus grande dimension se situant au plus prêt du centre (O) du cercle (C), et les zones de Fresnel (2) ont une dimension (Δr) constante comprise entre 500 μm et 100 μm à l'extérieur du cercle (C). D'une façon préférentielle, la pastille selon l'invention est telle que les zones de Fresnel (2) ont une dimension (Δr) variable comprise entre 2,5 mm et 250 μm à l'intérieure du cercle (C), la plus grande dimension se situant au plus prêt du centre (O) du cercle (C), et les zones de Fresnel (2) ont une dimension (Δr) constante de 250 μm à l'extérieur du cercle (C). La pastille 1 peut avoir une vergence positive ou négative, en fonction du sens de variation de son épaisseur selon la direction r, à l'intérieur de chaque zone de Fresnel 2. La figure 1b correspond à une pastille convergente. La variation de l'épaisseur de la pastille à l'intérieur de chaque zone 2 peut être, en particulier, une fonction quadratique de r. La pastille selon l'invention peut également présenter un cylindre, celui-ci permettant alors d'apporter une prise en compte de l'astigmatisme du porteur si nécessaire. Dans ce mode de réalisation particulier, la pastille est telle que la face avant convexe lisse de ladite pastille présente une surface cylindrique ou une surface torique.Under the above conditions, and for an optical power of the pellet 1 less than or equal to 10 diopters, Δr can be between 100 microns and 5 mm. According to the invention, the pellet is such that the Fresnel zones (2) have a dimension (Δr) variable between 5 mm and 100 μm inside the circle (C), the largest dimension being closer to the center (O) of the circle (C), and the Fresnel zones (2) have a constant dimension (Δr) of between 500 μm and 100 μm outside the circle (C). In a preferential manner, the pellet according to the invention is such that the Fresnel zones (2) have a variable size (Δr) of between 2.5 mm and 250 μm inside the circle (C), the most large dimension is closest to the center (O) of the circle (C), and the Fresnel zones (2) have a constant dimension (Δr) of 250 μm outside the circle (C). The pellet 1 may have a positive or negative vergence, depending on the direction of variation of its thickness along the direction r, within each Fresnel zone 2. FIG. 1b corresponds to a convergent pellet. The variation of the thickness of the pellet inside each zone 2 may be, in particular, a quadratic function of r. The tablet according to the invention may also have a cylinder, which then makes it possible to take into account the astigmatism of the wearer if necessary. In this particular embodiment, the pellet is such that the smooth convex front face of said pellet has a cylindrical surface or a toric surface.
La figure 2a montre une lentille ophtalmique adaptable à une paire de lunettes qui sont munies, sur leurs faces postérieures SO, ou faces concaves, de pastilles conformes à la figure 1b. La lentille de la figure 2a, référencé 10, peut être une lentille de protection solaire avec une puissance optique nulle, étant donné qu'elle possède deux faces parallèles. La pastille 1 lui confère alors une puissance non nulle, qui permet de corriger un défaut d'amétropie et éventuellement d'astigmatisme d'un porteur de la lentille. De cette façon, la pastille 1 permet d'adapter n'importe quelle lentille de protection solaire à un porteur ayant une distorsion visuelle. La paire de lunettes comprenant une telle lentille 10 peut alors être choisie par le porteur en fonction de son esthétisme, de sa teinte, ou de la forme de la monture associée. La lentille de la figure 2a, référencé 10, correspond à une correction de myopie, étant donné qu'il est moins épais en son centre qu'à sa périphérie. La pastille 1 permet alors d'adapter la force de la correction en fonction du degré de myopie du porteur. Dans ce cas, Ia pastille 1 est placée sur le verre 10 de façon à superposer les axes optiques respectifs du verre et de la pastille. Une fonction identique est obtenue avec un verre correcteur d'hypermétropie. La pastille 1 est appliquée sur la face postérieure SO de la lentille 10 qui est lisse. Cette opération peut se faire directement par Ie praticien ou le porteur sur la paire de lunettes dans laquelle la lentille est montée sur la monture choisie par le porteur.FIG. 2a shows an ophthalmic lens adaptable to a pair of spectacles which are provided, on their posterior faces SO, or concave faces, with pellets according to FIG. 1b. The lens of FIG. 2a, referenced 10, may be a sun protection lens with zero optical power, since it has two parallel faces. The pellet 1 then gives it a non-zero power, which corrects a lack of ametropia and possibly astigmatism of a wearer of the lens. In this way, the patch 1 makes it possible to adapt any sun protection lens to a wearer having a visual distortion. The pair of spectacles comprising such a lens 10 may then be chosen by the wearer according to his aesthetics, his color, or the shape of the associated frame. The lens of Figure 2a, referenced 10, corresponds to a correction of myopia, since it is thinner at its center than at its periphery. The pellet 1 then allows to adapt the strength of the correction according to the degree of myopia of the wearer. In this case, the tablet 1 is placed on the glass 10 so as to superpose the respective optical axes of the glass and the tablet. An identical function is obtained with a corrective lens of hyperopia. The pellet 1 is applied to the posterior surface SO of the lens 10 which is smooth. This operation can be done directly by the practitioner or the wearer on the pair of glasses in which the lens is mounted on the frame chosen by the wearer.
La figure 3 représente un exemple de variation des amplitudes Δz des sauts de hauteur 3 selon Ia direction radiale r. Lorsque r est inférieur au rayonFIG. 3 represents an example of variation of the amplitudes Δz of the jumps of height 3 along the radial direction r. When r is smaller than radius
Rc du cercle C, les amplitudes Δz des sauts 3 sont constantes et la dimension radiale Δr des zones 2 diminue pour des zones 2 de plus en plus grandes. Au delà de la valeur Rc, c'est-à-dire dans une partie périphérique de la pastille 1 à l'extérieur du cercle C, les sauts de hauteur 3 ont des amplitudes Δz qui augmentent.Rc of the circle C, the amplitudes Δz of the jumps 3 are constant and the radial dimension Δr of the zones 2 decreases for zones 2 of larger and larger. Beyond the value Rc, that is to say in a peripheral portion of the pellet 1 outside the circle C, the jumps of height 3 have amplitudes Δz which increase.
La pastille 1 est collée sur Ia face SO de la lentille 10, grâce aux propriétés d'adhésion intrinsèque du matériau constitutif de ladite pastille, ou éventuellement par utilisation d'une fine pellicule d'eau entre les deux interfaces, celle-ci servant de vecteur pour initier le contact entre les éléments. Ainsi selon l'invention le matériau constitutif de la pastille doit à la fois combiner des propriétés de transparence permettant de conserver la qualité optique du composant optique destiné à le recevoir, des propriétés de "tack", ainsi que des propriétés physiques permettant de lui conférer une certaine souplesse afin de l'adapter d'une façon au rayon de courbure du composant optique devant Ie porter. D'une façon avantageuse, la matériau constitutif de la pastille selon l'invention présente un dureté comprise entre 70 et 95 shore A, une diffusion comprise entre 2,0% et 0,4%, préférentiellement inférieure à 1%. Parmi les matériaux utilisables dons Ie cadre de l'invention on citera notamment, les matériaux transparents thermoplastiques choisi parmi les polymères polyuréthane, polychlorure de vinyle, polyéthylène téréphtalate, po!yméthyl(meth)acrylate et polycarbonate. D'une façon préférentielle le matériau constitutif de la pastille est choisi parmi thermoplastiques polyuréthane et thermoplastique polychlorure de vinyle.The pellet 1 is adhered to the face SO of the lens 10, thanks to the intrinsic adhesion properties of the material constituting said pellet, or possibly by using a thin film of water between the two interfaces, which serves as vector to initiate contact between elements. Thus, according to the invention, the material constituting the pellet must combine both transparency properties that make it possible to preserve the optical quality of the optical component intended to receive it, the "tack" properties, as well as the physical properties enabling it to be conferred. a certain flexibility in order to adapt it in a manner to the radius of curvature of the optical component to wear it. Advantageously, the material constituting the pellet according to the invention has a hardness of between 70 and 95 shore A, a diffusion of between 2.0% and 0.4%, preferably less than 1%. Among the materials that can be used within the scope of the invention, mention will in particular be made of transparent thermoplastic materials chosen from polyurethane polymers, polyvinyl chloride, polyethylene terephthalate polymers, poly (meth) acrylate polymers and polycarbonate polymers. In a preferential way the constituent material of the pellet is selected from thermoplastic polyurethane and thermoplastic polyvinyl chloride.
Le matériau de la lentille ophtalmique, peut quand à lui être de type minéral ou organique. A titre indicatif mais non limitatif, on peut citer comme matériau organique pouvant être utilisé dans le cadre de l'invention les matériaux classiquement utilisés en optique et en ophtalmie. Par exemple, sont adaptés les substrats du type polycarbonate; polyamide ; polyimides ; polysulfones ; copolymères de poly(éthylènetérephtalate) et polycarbonate; polyoléfines, notamment polynorbornènes ; polymères et copolymères de diéthylèneglycol bis(allylcarbonate); polymères et copolymères (méth)acryliques notamment polymères et copolymères (méth)acryliques dérivés de bisphenol-A; polymères et copolymères thio(méth)acryliques ; polymères et copolymères uréthane et thiouréthane ; polymères et copolymères époxy et polymères et copolymères épisulfide. II est entendu que de nombreuses adaptations peuvent être introduites dans les réalisations qui ont été décrites en détail ci-dessus, tout en conservant certains au moins des avantages de l'invention. En particulier, l'Homme du métier comprendra que les matériaux et les valeurs citées ne sont qu'à but d'illustration, et peuvent être modifiées. The material of the ophthalmic lens can be of mineral or organic type. As an indication but not limiting, mention may be made as organic material that can be used in the context of the invention the materials conventionally used in optics and ophthalmia. For example, substrates of the polycarbonate type are suitable; polyamide; polyimides; polysulfones; copolymers of poly (ethylene terephthalate) and polycarbonate; polyolefins, especially polynorbornenes; polymers and copolymers of diethylene glycol bis (allyl carbonate); (meth) acrylic polymers and copolymers, especially polymers and (meth) acrylic copolymers derived from bisphenol-A; thio (meth) acrylic polymers and copolymers; urethane and thiourethane polymers and copolymers; epoxy polymers and copolymers and episulfide polymers and copolymers. It is understood that many adaptations can be introduced in the embodiments which have been described in detail above, while retaining at least some of the advantages of the invention. In particular, those skilled in the art will understand that the materials and values cited are for illustrative purposes only, and may be modified.

Claims

R E V E N D I C A T I O N S
1. Pastille (1 ) destinée à être fixée sur une surface courbe concave1. Pad (1) intended to be fixed on a concave curved surface
(SO) d'un composant optique (10) pour modifier une puissance optique dudit composant, la pastille comprenant une lentille de Fresnel formée d'une série de zones de Fresnel (2) disposées les unes à l'intérieur des autres parallèlement à une face lisse de ladite pastille (S2) et présentant des sauts de hauteur (3) entre deux zones successives, lesdits sauts de hauteur étant mesurés selon une direction (z) perpendiculaire à la face lisse en un centre optique de la pastille (O), la pastille étant caractérisée en ce qu'elle possède: - une forme générale sphérique en plus des sauts de hauteur (3) entre zones de Fresnel successives, ladite forme générale sphérique présentant un rayon de courbure moyen compris entre 135 mm et 53 mm,(SO) of an optical component (10) for modifying an optical power of said component, the chip comprising a Fresnel lens formed of a series of Fresnel zones (2) arranged inside each other parallel to a smooth face of said pellet (S2) and having jumps in height (3) between two successive zones, said height jumps being measured in a direction (z) perpendicular to the smooth face at an optical center of the pellet (O), the tablet being characterized in that it has: a general spherical shape in addition to jumps in height (3) between successive Fresnel zones, said general spherical shape having an average radius of curvature of between 135 mm and 53 mm,
- et dans laquelle les sauts de hauteur (3) entre zones de Fresnel successives sont situés sur une face (S1 ) concave de la pastille, lesdits sauts de hauteur (3) entre zones de Fresnel successives présentant:- And in which the jumps in height (3) between successive Fresnel zones are located on a concave face (S1) of the pellet, said jumps in height (3) between successive Fresnel zones having:
- des amplitudes constantes à l'intérieur d'un cercle de rayon (C) entourant le centre optique de la pastille (O) et de dimension définit en fonction de la puissance de la pastille,constant amplitudes inside a circle of radius (C) surrounding the optical center of the pellet (O) and of size defined as a function of the power of the pellet,
- et des amplitudes variables qui augmentent dans une partie périphérique de la pastille, en s'éloignant du centre optique (O) à l'extérieur dudit cercle (C),and variable amplitudes which increase in a peripheral part of the patch, away from the optical center (O) outside said circle (C),
- ledit cercle de rayon (C) présentant une valeur comprise entre 5 mm et 25 mm pour une puissance comprise entre 1 dioptrie et 10 dioptries, et une première amplitude centrale de saut de hauteur supérieure ou égale à 5μm.said circle of radius (C) having a value of between 5 mm and 25 mm for a power comprised between 1 diopter and 10 diopters, and a first central amplitude of jump of height greater than or equal to 5 μm.
2. Pastille selon la revendication 1 présentant un rayon de courbure moyen compris entre 88 mm et 53 mm, et préférentieilement égale à 66 mm.2. The tablet of claim 1 having an average radius of curvature of between 88 mm and 53 mm, and preferably equal to 66 mm.
3. Pastille selon l'une quelconque des revendications 1 ou 2, dans laquelle les sauts de hauteur (3) entre zones de Fresnel successives à l'intérieur du cercle (C) ont des amplitudes comprises entre 5 μm et 25 μm, et les sauts de hauteur (3) entres zones de Fresnel successives à l'extérieur du cercle (C) jusqu'à une partie périphérique de la pastille ont des amplitudes variables comprises entre 5 μm et 250 μm.3. The tablet according to any one of claims 1 or 2, wherein the jumps in height (3) between successive Fresnel zones to inside the circle (C) have amplitudes between 5 μm and 25 μm, and the jumps in height (3) between successive Fresnel zones outside the circle (C) to a peripheral portion of the pellet have variable amplitudes between 5 μm and 250 μm.
4. Pastille selon la revendication 3, dans laquelle les sauts de hauteurThe tablet according to claim 3, wherein the height jumps
(3) entre zones de Fresnel successives à l'intérieur du cercle (C) ont des amplitudes comprises entre 10 μm et 20 μm,(3) between successive Fresnel zones inside the circle (C) have amplitudes of between 10 μm and 20 μm,
5. Pastille selon l'une quelconque des revendications précédentes, dans laquelle les zones de Fresnel (2) ont une dimension (Δr) comprise entre 100 μm et 5 mm, selon une direction radiale (r) passant par le centre optique (O) et perpendiculaire à un axe optique de la pastille.5. A tablet according to any one of the preceding claims, wherein the Fresnel zones (2) have a dimension (Δr) of between 100 μm and 5 mm, in a radial direction (r) passing through the optical center (O). and perpendicular to an optical axis of the pellet.
6. Pastille selon la revendication 5 dans laquelle les zones de Fresnel (2) ont une dimension (Δr) variable comprise entre 5 mm et 100 μm à l'intérieure du cercle (C) la plus grande dimension se situant au plus prêt du centre (O) du cercle (C), et les zones de Fresnel (2) ont une dimension (Δr) constante comprise entre 500 μm et 100 μm à l'extérieur du cercle (C).6. A tablet according to claim 5 wherein the Fresnel zones (2) have a dimension (Δr) variable between 5 mm and 100 microns inside the circle (C) the largest dimension is closest to the center (O) of the circle (C), and the Fresnel zones (2) have a constant dimension (Δr) of between 500 μm and 100 μm outside the circle (C).
7. Pastille selon la revendication 6 dans laquelle les zones de Fresnel (2) ont une dimension (Δr) variable comprise entre 2,5 mm et 250 μm à l'intérieure du cercle (C), la plus grande dimension se situant au plus prêt du centre (O) du cercle (C), et les zones de Fresnel (2) ont une dimension (Δr) constante de 250 μm à l'extérieur du cercle (C)..7. A tablet according to claim 6 wherein the Fresnel zones (2) have a variable size (Δr) of between 2.5 mm and 250 μm inside the circle (C), the largest dimension being at most near the center (O) of the circle (C), and the Fresnel zones (2) have a constant dimension (Δr) of 250 μm outside the circle (C).
8. Pastille selon l'une quelconque des revendications précédentes, dans laquelle les sauts de hauteur (3) entre zones de Fresnel successives dans la zone périphérique (A) ont des amplitudes constantes ladite amplitude correspondant à l'amplitude du dernier saut de hauteur (3) entre zones de Fresnel successives à l'extérieur du cercle (C), et une dimension (Δr) constante correspondant à la dimension (Δr) constante entre zones de Fresnel successives à l'extérieur du cercle (C) 8. A tablet according to any one of the preceding claims, wherein the jumps in height (3) between successive Fresnel zones in the peripheral zone (A) have constant amplitudes said amplitude corresponding to the amplitude of the last jump of height ( 3) between successive Fresnel zones outside the circle (C), and a constant dimension (Δr) corresponding to the constant dimension (Δr) between successive Fresnel zones outside the circle (C)
9. Pastille selon l'une quelconque des revendications précédentes, ayant une épaisseur moyenne (e) comprise entre 2 mm et 0,5 mm, mesurée perpendiculairement à la face lisse (S2) de la pastille.9. A tablet according to any one of the preceding claims, having an average thickness (e) of between 2 mm and 0.5 mm, measured perpendicularly to the smooth face (S2) of the pellet.
10. Pastille selon l'une quelconque des revendications précédentes dans laquelle la face avant convexe lisse de ladite pastille présente une surface cylindrique ou une surface torique.10. A tablet according to any one of the preceding claims wherein the smooth convex front face of said wafer has a cylindrical surface or a toric surface.
11. Pastille selon l'une quelconque des revendications précédentes, comprenant un matériau transparent présentant une dureté comprise entre 70 et 95 shore A.11. A tablet according to any one of the preceding claims, comprising a transparent material having a hardness between 70 and 95 Shore A.
12. Pastille selon l'une quelconque des revendications précédentes, comprenant un matériau transparent présentant une diffusion comprise entre 2,0 % et 0,4 %, préférentiellement inférieure à 1%.12. A tablet according to any one of the preceding claims, comprising a transparent material having a diffusion of between 2.0% and 0.4%, preferably less than 1%.
13. Pastille selon l'une quelconque des revendications 11 et 12, comprenant un matériau thermoplastique transparent choisi parmi les polymères polyuréthane, polychlorure de vinyle, polyéthylène téréphtalate, polyméthyl(meth)acrylate et polycarbonate.13. A tablet according to any one of claims 11 and 12, comprising a transparent thermoplastic material selected from polyurethane polymers, polyvinyl chloride, polyethylene terephthalate, polymethyl (meth) acrylate and polycarbonate.
14. Pastille selon la revendication 13 comprenant un matériau transparent choisit parmi thermoplastiques polyuréthane et thermoplastique polychlorure de vinyle.14. A tablet according to claim 13 comprising a transparent material chosen from thermoplastic polyurethane and thermoplastic polyvinyl chloride.
15. Elément optique comprenant un composant optique de base (10) et une pastille (1 ) selon l'une quelconque des revendications 1 à 14, ladite pastille étant fixée sur la face arrière concave dudit composant au moyen de sa face convexe lisse..An optical element comprising a base optical component (10) and a wafer (1) according to any one of claims 1 to 14, said wafer being fixed on the concave rear face of said component by means of its smooth convex face.
16. Elément selon la revendication 15, dans lequel la pastille (1 ) est fixée sur le composant (10) au moyen d'une pellicule d'eau disposée en tant que vecteur entre ladite pastille et ledit composant. The element of claim 15, wherein the wafer (1) is attached to the component (10) by means of a film of water disposed as a carrier between said wafer and said component.
17. Elément selon l'une quelconque des revendications 15 ou 16, dans lequel le composant de base est une lentille ophtalmique.An element according to any one of claims 15 or 16, wherein the base component is an ophthalmic lens.
18. Elément selon la revendication 17, dans lequel le composant de base est une lentille ophtalmique correctrice d'amétropie.The element of claim 17, wherein the base component is an ophthalmic corrective ametropic lens.
19. Elément selon la revendication 17 ou 18, dans lequel la lentille ophtalmique est teintée ou partiellement réfléchissante.The element of claim 17 or 18, wherein the ophthalmic lens is tinted or partially reflective.
20. Elément selon l'une quelconque des revendications 15 à 19, dans lequel le composant de base est une lentille adaptée à une paire de lunettes de protection solaire (10).20. Element according to any one of claims 15 to 19, wherein the base component is a lens adapted to a pair of sunglasses (10).
21. Elément selon l'une quelconque des revendications 15 à 19, dans lequel le composant de base est une lentille de masque, notamment masque solaire, de ski ou de plongée, ou une visière, notamment une visière de casque.21. Element according to any one of claims 15 to 19, wherein the base component is a mask lens, including sun mask, ski or diving, or a visor, including a helmet visor.
22. Paire de lunettes comprenant au moins une lentille (10,) et une pastille (1 ) selon l'une quelconque des revendications 1 à 14, fixée sur ladite lentille. 22. Pair of spectacles comprising at least one lens (10) and a wafer (1) according to any one of claims 1 to 14, fixed on said lens.
EP08865631.9A 2007-12-07 2008-12-04 Curved disc for modifying a power of an optical component Active EP2217962B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0759664A FR2924819B1 (en) 2007-12-07 2007-12-07 PASTILLE CURVE FOR MODIFYING A POWER OF AN OPTICAL COMPONENT
PCT/FR2008/052205 WO2009080940A1 (en) 2007-12-07 2008-12-04 Curved disc for modifying a power of an optical component

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EP2217962A1 true EP2217962A1 (en) 2010-08-18
EP2217962B1 EP2217962B1 (en) 2021-06-16

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EP (1) EP2217962B1 (en)
JP (1) JP5512535B2 (en)
CN (1) CN101918881B (en)
BR (1) BRPI0820672B1 (en)
FR (1) FR2924819B1 (en)
WO (1) WO2009080940A1 (en)

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CN101918881A (en) 2010-12-15
EP2217962B1 (en) 2021-06-16
BRPI0820672A2 (en) 2015-06-16
BRPI0820672B1 (en) 2019-04-09
FR2924819B1 (en) 2010-05-14
CN101918881B (en) 2012-02-08
JP2011507011A (en) 2011-03-03
US20100259717A1 (en) 2010-10-14
US8348423B2 (en) 2013-01-08
JP5512535B2 (en) 2014-06-04
WO2009080940A1 (en) 2009-07-02
FR2924819A1 (en) 2009-06-12

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